/Engine/Source/Runtime/Engine/Classes/Engine/GameInstance.h
IPlatformInputDeviceMapper
virtual void HandleInputDeviceConnectionChange ( EInputDeviceConnectionState NewConnectionState, [FPlatformUserId](API\Runtime\Core\Misc\FPlatformUserId) PlatformUserId, [FInputDeviceId](API\Runtime\Core\Misc\FInputDeviceId) InputDeviceId )